Isonitrile Trapping Reactions under Thermolysis of Alkoxyamines for the Synthesis of Quinolines
摘要:
An efficient tandem radical process comprising a thermal alkoxyamine homolysis, an isonitrile trapping reaction, a 5-exo-trig cyclization, and a homolytic aromatic substitution leads to substituted dihydroquinolines. Depending on the substituent R-1, oxidation to dihydro-1H-cyclopenta[b]quinolines (for R-1 = aryl) or tautomerization to tetrahydro-1H-cyclopenta[b]quinolines (for R-1 = CO2Me, CN) occurs. The heterocycles are obtained in moderate to good yields. Upon using microwave-induced heating, the reaction time can be shortened from 3 days to 30 min.
Isonitrile Trapping Reactions under Thermolysis of Alkoxyamines for the Synthesis of Quinolines
摘要:
An efficient tandem radical process comprising a thermal alkoxyamine homolysis, an isonitrile trapping reaction, a 5-exo-trig cyclization, and a homolytic aromatic substitution leads to substituted dihydroquinolines. Depending on the substituent R-1, oxidation to dihydro-1H-cyclopenta[b]quinolines (for R-1 = aryl) or tautomerization to tetrahydro-1H-cyclopenta[b]quinolines (for R-1 = CO2Me, CN) occurs. The heterocycles are obtained in moderate to good yields. Upon using microwave-induced heating, the reaction time can be shortened from 3 days to 30 min.
Silver-Catalyzed Decarboxylative Bromination of Aliphatic Carboxylic Acids
作者:Xinqiang Tan、Tao Song、Zhentao Wang、He Chen、Lei Cui、Chaozhong Li
DOI:10.1021/acs.orglett.7b00439
日期:2017.4.7
The silver-catalyzed Hunsdiecker bromination of aliphaticcarboxylicacids is described. With Ag(Phen)2OTf as the catalyst and dibromoisocyanuric acid as the brominating agent, various aliphaticcarboxylicacids underwent decarboxylative bromination to provide the corresponding alkyl bromides under mild conditions. This method not only is efficient and general but also enjoys wide functional group